# Java Program to print perfect numbers between two given numbers

A number is called **perfect number**, if the number is equal to the sum of all of its factors except itself. For example, 6 , 28 are perfect numbers.

Factors of 6 (Except 6) are 1 , 2 , 3. Sum of 1+2+3=6

Factors of 28 (Except 28) are 1, 2, 4, 7, 14. Sum of 1+2+4+7+14 = 28

Now the following program prints all the perfect numbers between two given numbers .

package com.javaonline; import java.util.Scanner; class PerfectNumberWithJava { public static void main(String main[]) { Scanner sc = new Scanner(System.in); System.out.println("Enter Start Number"); int start=sc.nextInt(); System.out.println("Enter End Number"); int end=sc.nextInt(); System.out.println("Perfect Numbers between " + start + " and " + end + " are :"); for (int i=start; i<=end; i++) { int sum=0; for (int j=1 ; j<i;j++) { if (i % j==0) sum=sum+j; } if (i==sum) System.out.print(i + "\t"); } } }

**Output :**

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